I'm new to bp also.
My SIL "guided" me when I bought a in-line this fall. He had a CVA Optima that is reasonably priced and his shoots tight groups at 100 yards so I bought one almost like it (mine has the camo stock) and run the same load through it as he does.
100 grains BlackHorn 209 (don't use 209 primers made for muzzleloading per the BP 209 website) and PowerBelt 245 aerotip. My groups just as tight as his does which tells me the CVA are good rifles. And the Powerbelt bullet is so easy to load, no sabots etc.
I'm no expert but I had pretty good beginners luck listening to the SIL so am passing it on.